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                                <h1 id="&#x9650;&#x6D41;">&#x9650;&#x6D41;</h1>
<p><a href="../&#x8FD0;&#x7EF4;/Nginx&#x9650;&#x6D41;.html">Nginx&#x9650;&#x6D41;</a></p>
<p><a href="http://naotu.baidu.com/file/063477dd3d9434a0d88233776d0aabf8?token=2dc74409ed07455f" target="_blank">&#x9650;&#x6D41;&#x8111;&#x56FE;</a></p>
<hr>
<h2 id="&#x6F0F;&#x6876;&#x7B97;&#x6CD5;-vs-&#x4EE4;&#x724C;&#x6876;&#x7B97;&#x6CD5;">&#x6F0F;&#x6876;&#x7B97;&#x6CD5; vs &#x4EE4;&#x724C;&#x6876;&#x7B97;&#x6CD5;</h2>
<p><strong>&#x6F0F;&#x6876;&#x7B97;&#x6CD5;(Leaky Bucket)</strong>&#xFF1A;&#x6C34;(&#x8BF7;&#x6C42;)&#x5148;&#x8FDB;&#x5165;&#x5230;&#x6F0F;&#x6876;&#x91CC;,&#x6F0F;&#x6876;&#x4EE5;&#x4E00;&#x5B9A;&#x7684;&#x901F;&#x5EA6;&#x51FA;&#x6C34;(&#x63A5;&#x53E3;&#x6709;&#x54CD;&#x5E94;&#x901F;&#x7387;),&#x5F53;&#x6C34;&#x6D41;&#x5165;&#x901F;&#x5EA6;&#x8FC7;&#x5927;&#x4F1A;&#x76F4;&#x63A5;&#x6EA2;&#x51FA;(&#x8BBF;&#x95EE;&#x9891;&#x7387;&#x8D85;&#x8FC7;&#x63A5;&#x53E3;&#x54CD;&#x5E94;&#x901F;&#x7387;),&#x7136;&#x540E;&#x5C31;&#x62D2;&#x7EDD;&#x8BF7;&#x6C42;,&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#x6F0F;&#x6876;&#x7B97;&#x6CD5;&#x80FD;&#x5F3A;&#x884C;&#x9650;&#x5236;&#x6570;&#x636E;&#x7684;&#x4F20;&#x8F93;&#x901F;&#x7387;.&#x793A;&#x610F;&#x56FE;&#x5982;&#x4E0B;:</p>
<p><img src="http://static.zybuluo.com/zero1036/vfuuofjrcahpoujijk795l6a/05DCF4D8-628D-4B27-AB47-123F8A4C2D67.png" alt="05DCF4D8-628D-4B27-AB47-123F8A4C2D67.png-123.9kB"></p>
<p><strong>&#x4EE4;&#x724C;&#x6876;&#x7B97;&#x6CD5;(Token Bucket)</strong>&#xFF1A;&#x4E0E; Leaky Bucket&#x5177;&#x6709;&#x76F8;&#x540C;&#x6548;&#x679C;&#x4F46;&#x53CD;&#x65B9;&#x5411;&#x7B97;&#x6CD5;&#xFF0C;&#x7CFB;&#x7EDF;&#x4EE5;&#x56FA;&#x5B9A;&#x901F;&#x5EA6;&#x6D3E;&#x53D1;token&#xFF0C;&#x8BF7;&#x6C42;&#x53D6;&#x8D70;token&#x540E;&#x6267;&#x884C;&#x5B9E;&#x9645;&#x64CD;&#x4F5C;&#xFF0C;&#x5F53;&#x6CA1;&#x6709;&#x53EF;&#x9886;&#x53D6;token&#x65F6;&#xFF0C;&#x8BF7;&#x6C42;&#x963B;&#x585E;&#x6216;&#x62D2;&#x7EDD;&#xFF0C;&#x793A;&#x610F;&#x56FE;&#x5982;&#x4E0B;&#xFF1A;</p>
<p><img src="http://static.zybuluo.com/zero1036/jbnqqcxojc8be4jvxakjj5na/054109C2-9398-45E8-9BC4-7239DBF2B5A0.png" alt="054109C2-9398-45E8-9BC4-7239DBF2B5A0.png-142.9kB"></p>
<p>&#x4E24;&#x8005;&#x6BD4;&#x8F83;&#x4E0B;&#x7684;&#x7279;&#x70B9;&#xFF1A;</p>
<ol>
<li><strong>&#x4EE4;&#x724C;&#x6876;</strong>&#xFF1A;&#x589E;&#x52A0;&#x4EE4;&#x724C;&#x901F;&#x7387;&#x6052;&#x5B9A;&#xFF1B;<strong>&#x6F0F;&#x6876;</strong>&#xFF1A;&#x6D88;&#x8D39;&#x4EE4;&#x724C;&#x6052;&#x5B9A;<ol>
<li><strong>&#x6F0F;&#x6876;</strong>&#x6876;&#x5C16;&#x51B3;&#x5B9A;&#x4E86;&#xFF0C;&#x65E0;&#x8BBA;&#x6D41;&#x91CF;&#x5927;&#x6216;&#x5C0F;&#xFF0C;&#x6D88;&#x8D39;&#x670D;&#x52A1;&#x90FD;&#x4EE5;&#x56FA;&#x5B9A;&#x901F;&#x7387;&#x6D88;&#x8D39;&#xFF0C;<strong>&#x5B8C;&#x5168;&#x5E73;&#x6ED1;&#x5904;&#x7406;</strong>&#x4E86;</li>
<li>&#x800C;<strong>&#x4EE4;&#x724C;&#x6876;</strong>&#xFF0C;&#x53EA;&#x8981;<strong>&#x672A;&#x8FBE;&#x5230;&#x81EA;&#x8EAB;&#x6700;&#x5927;&#x7684;&#x6D88;&#x8D39;&#x80FD;&#x529B;</strong>&#xFF0C;&#x5C31;&#x80FD;&#x6D88;&#x8D39;&#x6D41;&#x91CF;&#xFF0C;&#x5141;&#x8BB8;&#x4E86;&#x7B26;&#x5408;&#x81EA;&#x8EAB;&#x80FD;&#x529B;&#x4E0B;&#x7684;<strong>&#x7A81;&#x53D1;</strong></li>
</ol>
</li>
</ol>
<p>ps&#xFF1A;Nginx&#x9650;&#x6D41;&#x5C5E;&#x4E8E;&#x6F0F;&#x6876;&#xFF0C;Nginx&#x53EF;&#x4EE5;&#x6839;&#x636E;&#x7279;&#x5B9A;&#x6761;&#x4EF6;&#xFF0C;&#x8BBE;&#x7F6E;&#x5355;&#x4F4D;&#x65F6;&#x95F4;&#x5185;&#x53EF;&#x4EE5;&#x653E;&#x884C;&#x591A;&#x5C11;&#x8BF7;&#x6C42;</p>
<p><a href="../&#x8FD0;&#x7EF4;/Nginx&#x9650;&#x6D41;.html">Nginx&#x9650;&#x6D41;</a></p>
<p><img src="http://static.zybuluo.com/zero1036/qr6uxbrcetvcyurb0guwzw6x/49DD4072-03EF-40BA-A869-261BD7568917.png" alt="49DD4072-03EF-40BA-A869-261BD7568917.png-97.3kB"></p>
<h2 id="guava-ratelimiter">Guava RateLimiter</h2>
<h3 id="api">api</h3>
<p><code>limiter.acquire(i)</code>&#xFF1A;&#x4EE5;&#x963B;&#x585E;&#x7684;&#x65B9;&#x5F0F;&#x83B7;&#x53D6;&#x4EE4;&#x724C;</p>
<p><code>tryAcquire(int permits, long timeout, TimeUnit unit)</code>&#xFF1A;&#x8BBE;&#x7F6E;&#x7B49;&#x5F85;&#x8D85;&#x65F6;&#x65F6;&#x95F4;&#x7684;&#x65B9;&#x5F0F;&#x83B7;&#x53D6;&#x4EE4;&#x724C;&#xFF0C;&#x5982;&#x679C;&#x8D85;timeout&#x4E3A;0&#xFF0C;&#x5219;&#x4EE3;&#x8868;&#x975E;&#x963B;&#x585E;&#xFF0C;&#x83B7;&#x53D6;&#x4E0D;&#x5230;&#x7ACB;&#x5373;&#x8FD4;&#x56DE;</p>
<p><code>getRate()</code>&#xFF1A;&#x8FD4;&#x56DE;RateLimiter &#x914D;&#x7F6E;&#x4E2D;&#x7684;&#x7A33;&#x5B9A;&#x901F;&#x7387;&#xFF0C;&#x8BE5;&#x901F;&#x7387;&#x5355;&#x4F4D;&#x662F;&#x6BCF;&#x79D2;&#x591A;&#x5C11;&#x4EE4;&#x724C;&#x6570;</p>
<p><code>setRate(double permitsPerSecond)</code>&#xFF1A;&#x66F4;&#x65B0;RateLimite&#x7684;&#x7A33;&#x5B9A;&#x901F;&#x7387;&#xFF0C;&#x53C2;&#x6570;permitsPerSecond &#x7531;&#x6784;&#x9020;RateLimiter&#x7684;&#x5DE5;&#x5382;&#x65B9;&#x6CD5;&#x63D0;&#x4F9B;</p>
<h3 id="&#x5E73;&#x6ED1;&#x7A81;&#x7136;&#x9650;&#x6D41;-smoothbursty">&#x5E73;&#x6ED1;&#x7A81;&#x7136;&#x9650;&#x6D41; SmoothBursty</h3>
<pre><code class="lang-java"><span class="hljs-comment">/**
 * &#x5E73;&#x6ED1;&#x7A81;&#x53D1;&#x9650;&#x6D41;&#xFF1A;SmoothBursty
 */</span>
<span class="hljs-meta">@Test</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">test1</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-comment">//&#x6BCF;&#x79D2;&#x5141;&#x8BB8;5&#x4E2A;&#x8BF7;&#x6C42;&#xFF0C;&#x8868;&#x793A;&#x6876;&#x5BB9;&#x91CF;&#x4E3A;5&#x4E14;&#x6BCF;&#x79D2;&#x65B0;&#x589E;5&#x4E2A;&#x4EE4;&#x724C;&#xFF0C;&#x5373;&#x6BCF;&#x9694;0.2&#x79D2;&#x65B0;&#x589E;&#x4E00;&#x4E2A;&#x4EE4;&#x724C;</span>
    RateLimiter limiter = RateLimiter.create(<span class="hljs-number">5</span>);
    <span class="hljs-comment">/**
     * &#x4E00;&#x6B21;&#x6027;&#x6D88;&#x8D39;5&#x4E2A;&#x4EE4;&#x724C;&#xFF0C;&#x6539;&#x53D8;&#x4E00;&#x6B21;&#x6027;&#x7684;&#x4EE4;&#x724C;&#x6570;&#xFF0C;&#x4F1A;&#x5F71;&#x54CD;&#x4E0B;&#x4E00;&#x4E2A;acquire&#x7684;&#x7B49;&#x5F85;&#x65F6;&#x95F4;
     * output : 0.0
     */</span>
    System.out.println(limiter.acquire(<span class="hljs-number">5</span>));
    <span class="hljs-comment">/**
     * limiter.acquire(1)&#x5C06;&#x7B49;&#x5F85;&#x5DEE;&#x4E0D;&#x591A;1&#x79D2;&#x6876;&#x4E2D;&#x624D;&#x80FD;&#x6709;&#x7B2C;&#x4E00;&#x4E2A;&#x4EE4;&#x724C;
     * output: 0.995618
     */</span>
    System.out.println(limiter.acquire(<span class="hljs-number">1</span>));
    <span class="hljs-comment">/**
     * 0.2&#x79D2;&#x540E;&#x6D3E;&#x53D1;&#x65B0;&#x4EE4;&#x724C;
     * output&#xFF1A;0.2
     */</span>
    System.out.println(limiter.acquire(<span class="hljs-number">1</span>));
    <span class="hljs-comment">/**
     * 0.2&#x79D2;&#x540E;&#x6D3E;&#x53D1;&#x65B0;&#x4EE4;&#x724C;
     * output&#xFF1A;0.2
     */</span>
    System.out.println(limiter.acquire(<span class="hljs-number">1</span>));
    <span class="hljs-comment">/**
     * 0.2&#x79D2;&#x540E;&#x6D3E;&#x53D1;&#x65B0;&#x4EE4;&#x724C;
     * output&#xFF1A;0.2
     */</span>
    System.out.println(limiter.acquire(<span class="hljs-number">1</span>));
}
</code></pre>
<h3 id="&#x539F;&#x7406;">&#x539F;&#x7406;</h3>
<blockquote>
<p>&#x6052;&#x5B9A;&#x901F;&#x7387;&#x5411;&#x4EE4;&#x724C;&#x6876;&#x589E;&#x52A0;&#x4EE4;&#x724C;&#x7684;2&#x79CD;&#x5B9E;&#x73B0;&#x601D;&#x8DEF;&#xFF1A;
1&#x3001;&#x901A;&#x8FC7;&#x5B9A;&#x65F6;&#x5668;&#x5B9E;&#x73B0;&#xFF0C;&#x7F3A;&#x70B9;&#xFF1A;&#x6210;&#x672C;&#x9AD8;
2&#x3001;&#x901A;&#x8FC7;&#x8BA1;&#x5F55;&#x589E;&#x52A0;&#x4EE4;&#x724C;&#x7684;&#x65F6;&#x523B;&#xFF0C;&#x5E76;&#x8BA1;&#x7B97;&#x8BF7;&#x6C42;&#x6267;&#x884C;&#x7684;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#x4E4B;&#x5DEE;&#xFF0C;&#x83B7;&#x5F97;&#x4EE4;&#x724C;&#x7ED3;&#x679C;&#x3002;&#x7C7B;&#x4F3C;Guava LoadingCache&#x7684;&#x7F13;&#x5B58;&#x8FC7;&#x671F;&#x8BBE;&#x8BA1;&#x3002;</p>
</blockquote>
<p>&#x5173;&#x952E;&#x64CD;&#x4F5C;<code>resync(long nowMicros)</code>: &#x901A;&#x8FC7;&#x8BA1;&#x5F55;&#x589E;&#x52A0;&#x4EE4;&#x724C;&#x7684;&#x65F6;&#x523B;&#xFF0C;&#x5E76;&#x8BA1;&#x7B97;&#x8BF7;&#x6C42;&#x6267;&#x884C;&#x7684;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#x4E4B;&#x5DEE;&#xFF0C;&#x83B7;&#x5F97;&#x4EE4;&#x724C;&#x7ED3;&#x679C;</p>
<ol>
<li><code>nextFreeTicketMicros</code>&#xFF1A;&#x6700;&#x8FD1;&#x4E00;&#x4E2A;&#x65B0;&#x589E;&#x4EE4;&#x724C;&#x5230;&#x6876;&#x7684;&#x65F6;&#x523B;</li>
<li><code>maxPermits</code>&#xFF1A;&#x6700;&#x5927;&#x4EE4;&#x724C;&#x6570;</li>
<li><code>storedPermits</code>&#xFF1A;&#x6709;&#x6548;&#x4EE4;&#x724C;&#x4E66;&#x6570;</li>
</ol>
<p>code:</p>
<pre><code class="lang-java"><span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">resync</span><span class="hljs-params">(<span class="hljs-keyword">long</span> nowMicros)</span> </span>{
  <span class="hljs-comment">// if nextFreeTicket is in the past, resync to now</span>
  <span class="hljs-comment">// &#x5F53;&#x524D;&#x3010;&#x6700;&#x8FD1;&#x4E00;&#x4E2A;&#x65B0;&#x589E;&#x4EE4;&#x724C;&#x7684;&#x65F6;&#x523B;&#x3011;&#x5DF2;&#x8FC7;&#x53BB;&#xFF0C;&#x5219;&#x91CD;&#x65B0;&#x540C;&#x6B65;&#x8BA1;&#x7B97;&#x3010;nextFreeTicketMicros&#x3011;&#x4E0E;&#x3010;storedPermits&#x3011;</span>
  <span class="hljs-keyword">if</span> (nowMicros &gt; nextFreeTicketMicros) {
    <span class="hljs-comment">// &#x8BA1;&#x7B97;&#x65F6;&#x95F4;&#x5DEE;&#x5185;&#xFF0C;&#x53EF;&#x4EE5;&#x65B0;&#x589E;&#x7684;&#x4EE4;&#x724C;&#x6570;</span>
    <span class="hljs-keyword">double</span> newPermits = (nowMicros - nextFreeTicketMicros) / coolDownIntervalMicros();
    <span class="hljs-comment">// &#x5B58;&#x91CF;&#x52A0;&#x589E;&#x91CF;&#x4EE4;&#x724C;&#x6570; &#x4E0E; &#x4EE4;&#x724C;&#x6876;&#x603B;&#x91CF; &#x53D6;&#x8F83;&#x5C0F;&#x8005;&#x4F5C;&#x4E3A;&#x5B58;&#x91CF;&#x4EE4;&#x724C;&#x6570;</span>
    storedPermits = min(maxPermits, storedPermits + newPermits);
    <span class="hljs-comment">// &#x5F53;&#x524D;&#x65F6;&#x95F4;&#x8BBE;&#x4E3A; &#x3010;&#x6700;&#x8FD1;&#x4E00;&#x4E2A;&#x65B0;&#x589E;&#x4EE4;&#x724C;&#x7684;&#x65F6;&#x523B;&#x3011;</span>
    nextFreeTicketMicros = nowMicros;
  }
}
</code></pre>
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